/Engine/Source/Runtime/Experimental/GeometryCollectionEngine/Public/GeometryCollection/GeometryCollectionEngineConversion.h
Appends instanced mesh indices
static void AppendAutoInstanceMeshIndices ( [UGeometryCollection](API\Runtime\GeometryCollectionEngine\GeometryCollection\UGeometryCollection) * GeometryCollectionObject, int32 FromTransformIndex, const [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, const [TArray](API\Runtime\Core\Containers\TArray)< [UMaterialInterface](API\Runtime\Engine\Materials\UMaterialInterface) * > & Materials )